Combination with the characteristics of large public buildings, taking well considerations of maintenance of buildings on safety and reliability of the circumstances. Decision-making models of the large public building maintenance cycle was proposed based on maintenance of quality comprehensive evaluation. To quantify the degree of recovery of large public buildings based on the quality of maintenance using the method of AHP and Multi-level fuzzy comprehensive evaluation method. To make reasonable amendments on the reliability of experience according to the recovery degree of the reliability. In order to calculate the maintenance cycle of the large public buildings , the two models of maximum reliability and minimum total cost of building structure and equipment pipe components are applying with, and then to making dynamic arrangements of preventive maintenance cycle according to the quality of the maintenance.